

A096345


Primes of the form p*q  p  q, where p and q are two successive primes.


4



7, 23, 59, 191, 839, 1439, 1931, 5039, 8447, 11447, 23399, 26891, 36479, 41579, 46619, 57119, 59999, 77279, 110879, 163199, 232307, 323759, 370871, 414731, 470579, 521267, 566999, 606791, 664199, 678971, 776159, 824459, 835379, 879839
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,1


COMMENTS

These primes are not the sum of two squares.
The number of terms less than 10^n: 1, 3, 5, 9, 18, 35, 83, 190, 425, 1105, 2962, 7695, 20187, 54280, 147464, 402660, 1116912, ..., .  Robert G. Wilson v, Apr 09 2008


LINKS



EXAMPLE

a(3)=59 because 7*11  7  11=59.


MATHEMATICA

lst = {}; p = q = 2; Do[p = q; q = NextPrime@q; r = p*q  p  q; If[ PrimeQ@r, AppendTo[lst, r]], {n, 2^31  1}]; lst {* Robert G. Wilson v, Apr 09 2008 *}


CROSSREFS



KEYWORD

nonn


AUTHOR



EXTENSIONS



STATUS

approved



